Key factors for achieving high-definition storage
In order to achieve high-definition monitoring better, storage technology needs to be matched from several aspects such as capacity, performance, application response, and structure adaptation.
First, the storage products need more capacity and higher performance in the face of higher data transmission bandwidth and greater storage capacity requirements for HD surveillance. More importantly, when meeting these requirements, storage technology needs to be more closely integrated with surveillance applications, especially high-definition surveillance applications. In this regard, only products and solutions designed for specific applications can better meet the requirements.
Secondly, high-definition surveillance systems mostly use high-definition network cameras as monitoring point video capture devices. Such devices often do not carry long-lasting storage media themselves. The data storage process transfers data over the network and then on other specialized storage devices. Realize the storage of data.
Third, while high-definition surveillance brings higher definition quality, it comes with the increase of coded stream and the same storage time, but the pressure of storing data increases. This requires that the storage device can efficiently and completely implement secure writing of video data based on the characteristics of high-definition monitoring code streams.
Finally, high-definition storage will change the characteristics of the past monitoring system data and the local storage of the encoding device, and the data will be concentrated in one or more locations to achieve storage. In this way, how to quickly retrieve and obtain the required historical videos in the centralized mass data is also a new challenge.
In addition, systems that use high-definition encoded input typically use high-definition network cameras or domes, and the system presents an easily scalable modular architecture. For this feature of the front end, it also requires the back-end storage solution to have more flexibility to meet the requirements of the entire system for scalability.
Specific solutions for HD storage needs
Corresponding to the characteristics of high-definition monitoring data volume, higher storage reliability requirements, and more flexible system architecture, the issues that need to be solved in high-definition storage become clearer: In high-definition monitoring systems, storage devices and subsystems must have effective and complete recording functions. The reliability and security of the stored data should be considered from the media and system perspective; the flexible structure of the system should be able to achieve unified management and scheduling of storage resources to configure a flexible recording plan, and according to demand The changes are ready to respond to the extension of the system video recording time and the monitoring front-end expansion requirements.
In overcoming these problems, we are not more concerned with the choice of storage media, but based on the existing online storage media disk, to design different storage products, so as to meet the storage needs of different high-definition monitoring systems in multiple dimensions:
To achieve large-capacity storage, you can design multiple hard disk slots, compatible with large-capacity hard disk products, and provide a large amount of storage space through the expansion of external array cabinets.
For high-reliability storage requirements, RAID protection technology can be used at the device level. For example, RAID5 can support the redundancy of a hard disk, and RAID6 can support the redundancy of two hard disks. The device adopts a dual-controller architecture and uses the redundancy of physical hardware and the heartbeat in communication to ensure the reliability of storage services. At the system level, the N+1 device online redundancy mode and the video management server dual-system hot backup mode can be adopted.
In the system architecture, for the characteristics of the monitoring system, a distributed network storage solution is recommended to reduce the system transmission pressure. Different storage subsystems should also be adopted for high-definition monitoring systems of different sizes and different structures. For example, for systems that have been retrofitted in the old system and partially implemented in high-definition, hybrid DVRs can be used to implement high-definition video access and storage, which not only protects the original analog-standard definition video access, but also adds "high-definition" highlights to the system.
For the structure where the system monitoring points are relatively concentrated, an iSCSI direct-write structure can be designed. Utilize the embedded high-definition encoder and high-definition network front end (HD network camera or high-definition network dome) and IP-SAN, based on the iSCSI protocol, and use the data block as the unit to realize the direct writing of the monitoring video encoding end to the storage end. The storage resources of the entire monitoring system are managed by the storage management server in a unified manner, which realizes the unified scheduling and allocation of the storage space required for encoding front-end recording. According to the needs of flexible partition, change the size of the storage space for each encoding channel to allocate different sizes of storage resources to meet the different monitoring points of the system, different storage time length requirements. And can achieve accurate to the second-level positioning and immediate-release function. When the monitoring client needs to perform playback or download operations, it can directly obtain the required data from the IP-SAN storage device based on the authorization, and use the powerful data throughput capability of the IP-SAN to greatly increase the download performance and efficiency of the video. The storage resources provided by the IP-SAN devices in the system are managed by the storage management server in a unified manner, which can not only reduce the number of storage-related servers, but also seamlessly implement monitoring points in the background when an IP-SAN single-device fails. The data storage area is switched to ensure the continuous operation of the video recording service.
In view of the complex network structure of the monitoring system and the structure of storage hierarchy, NVR devices can be deployed in different monitoring areas to not only achieve storage of the video captured by HD monitoring points within the monitoring area, but also to set different recording types for different monitoring points. The time length strategy provides data streaming video recording. Based on the configuration of hot spare storage, when a single NVR fails, the backup NVR takes over its video recording service.
Future HD storage
As the pace of the monitoring system toward the high-definition era is accelerating, storage as an important part of system applications is bound to have more development and changes.
The future monitoring and storage will be the same as the current general-purpose data storage. Along with the energy-saving design of the device itself, there are more storage processes and system configuration optimizations. do. Such as increasing the storage of MAID applications, in order to make the non-reading disk in a non-working state, reducing power consumption; by optimizing the video writing method, reduce the hardware device configuration in the system to reduce power consumption.
In addition, the future video storage will no longer be merely the storage of video data and related video index information, but also the storage of additional information related to intelligent surveillance, because high-definition surveillance, in addition to bringing higher clarity, There will also be more intelligent monitoring applications embodied in it. How to realize the association of video data and information data in the storage process in order to realize the intelligent application and improve its application efficiency has very practical significance.
In order to achieve high-definition monitoring better, storage technology needs to be matched from several aspects such as capacity, performance, application response, and structure adaptation.
First, the storage products need more capacity and higher performance in the face of higher data transmission bandwidth and greater storage capacity requirements for HD surveillance. More importantly, when meeting these requirements, storage technology needs to be more closely integrated with surveillance applications, especially high-definition surveillance applications. In this regard, only products and solutions designed for specific applications can better meet the requirements.
Secondly, high-definition surveillance systems mostly use high-definition network cameras as monitoring point video capture devices. Such devices often do not carry long-lasting storage media themselves. The data storage process transfers data over the network and then on other specialized storage devices. Realize the storage of data.
Third, while high-definition surveillance brings higher definition quality, it comes with the increase of coded stream and the same storage time, but the pressure of storing data increases. This requires that the storage device can efficiently and completely implement secure writing of video data based on the characteristics of high-definition monitoring code streams.
Finally, high-definition storage will change the characteristics of the past monitoring system data and the local storage of the encoding device, and the data will be concentrated in one or more locations to achieve storage. In this way, how to quickly retrieve and obtain the required historical videos in the centralized mass data is also a new challenge.
In addition, systems that use high-definition encoded input typically use high-definition network cameras or domes, and the system presents an easily scalable modular architecture. For this feature of the front end, it also requires the back-end storage solution to have more flexibility to meet the requirements of the entire system for scalability.
Specific solutions for HD storage needs
Corresponding to the characteristics of high-definition monitoring data volume, higher storage reliability requirements, and more flexible system architecture, the issues that need to be solved in high-definition storage become clearer: In high-definition monitoring systems, storage devices and subsystems must have effective and complete recording functions. The reliability and security of the stored data should be considered from the media and system perspective; the flexible structure of the system should be able to achieve unified management and scheduling of storage resources to configure a flexible recording plan, and according to demand The changes are ready to respond to the extension of the system video recording time and the monitoring front-end expansion requirements.
In overcoming these problems, we are not more concerned with the choice of storage media, but based on the existing online storage media disk, to design different storage products, so as to meet the storage needs of different high-definition monitoring systems in multiple dimensions:
To achieve large-capacity storage, you can design multiple hard disk slots, compatible with large-capacity hard disk products, and provide a large amount of storage space through the expansion of external array cabinets.
For high-reliability storage requirements, RAID protection technology can be used at the device level. For example, RAID5 can support the redundancy of a hard disk, and RAID6 can support the redundancy of two hard disks. The device adopts a dual-controller architecture and uses the redundancy of physical hardware and the heartbeat in communication to ensure the reliability of storage services. At the system level, the N+1 device online redundancy mode and the video management server dual-system hot backup mode can be adopted.
In the system architecture, for the characteristics of the monitoring system, a distributed network storage solution is recommended to reduce the system transmission pressure. Different storage subsystems should also be adopted for high-definition monitoring systems of different sizes and different structures. For example, for systems that have been retrofitted in the old system and partially implemented in high-definition, hybrid DVRs can be used to implement high-definition video access and storage, which not only protects the original analog-standard definition video access, but also adds "high-definition" highlights to the system.
For the structure where the system monitoring points are relatively concentrated, an iSCSI direct-write structure can be designed. Utilize the embedded high-definition encoder and high-definition network front end (HD network camera or high-definition network dome) and IP-SAN, based on the iSCSI protocol, and use the data block as the unit to realize the direct writing of the monitoring video encoding end to the storage end. The storage resources of the entire monitoring system are managed by the storage management server in a unified manner, which realizes the unified scheduling and allocation of the storage space required for encoding front-end recording. According to the needs of flexible partition, change the size of the storage space for each encoding channel to allocate different sizes of storage resources to meet the different monitoring points of the system, different storage time length requirements. And can achieve accurate to the second-level positioning and immediate-release function. When the monitoring client needs to perform playback or download operations, it can directly obtain the required data from the IP-SAN storage device based on the authorization, and use the powerful data throughput capability of the IP-SAN to greatly increase the download performance and efficiency of the video. The storage resources provided by the IP-SAN devices in the system are managed by the storage management server in a unified manner, which can not only reduce the number of storage-related servers, but also seamlessly implement monitoring points in the background when an IP-SAN single-device fails. The data storage area is switched to ensure the continuous operation of the video recording service.
In view of the complex network structure of the monitoring system and the structure of storage hierarchy, NVR devices can be deployed in different monitoring areas to not only achieve storage of the video captured by HD monitoring points within the monitoring area, but also to set different recording types for different monitoring points. The time length strategy provides data streaming video recording. Based on the configuration of hot spare storage, when a single NVR fails, the backup NVR takes over its video recording service.
Future HD storage
As the pace of the monitoring system toward the high-definition era is accelerating, storage as an important part of system applications is bound to have more development and changes.
The future monitoring and storage will be the same as the current general-purpose data storage. Along with the energy-saving design of the device itself, there are more storage processes and system configuration optimizations. do. Such as increasing the storage of MAID applications, in order to make the non-reading disk in a non-working state, reducing power consumption; by optimizing the video writing method, reduce the hardware device configuration in the system to reduce power consumption.
In addition, the future video storage will no longer be merely the storage of video data and related video index information, but also the storage of additional information related to intelligent surveillance, because high-definition surveillance, in addition to bringing higher clarity, There will also be more intelligent monitoring applications embodied in it. How to realize the association of video data and information data in the storage process in order to realize the intelligent application and improve its application efficiency has very practical significance.
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